This add-ons code is available on GitHub (https://github.com/NiklasGollenstede/wikipedia-peek). If you have any problems, please report them there (https://github.com/NiklasGollenstede/wikipedia-peek/issues).

The add-on itself does not collect any data. Note however, that the article previews are queried form Wikipedia in a separate query each time you hover over a link long enough.